Add `fastq-dl` as download method

### Description of feature > Hey folks, I found this tool: https://github.com/rpetit3/fastq-dl and would like to try to add it to fetchngs since I encountered a couple of problems with sra-tools and thought this might be a nice alternative? From the # fetchngs Slack channel: https://nfcore.slack.com/archives/C024915L4KB/p1741267281724959